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H. E. WAITE.

MAGNETO TELEPHONE.

No. 318,058. Patented May 19, 1885.

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UNITED STATES PAIENT Germs.

HENRY E. IVAITE, OF NEWV YORK, N. Y.

MAGNETO-TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 818,058, dated IVIay19, 1885.

Application filed August 28, 1884.

To all whom it may concern:

Be it known that I, HENRY E. WAI'rn, a citizen of the United States,residing in the city, county, and State of New York, have inventedcertain new and useful Improvements in Magneto-Telephones, ofwhich thefollowing is a specification.

My invention relates to magnetotelephones; and it has for its object toimprove the con struction of such instruments to render them moreeffective and at the same time inexpensive to manufacture; and itconsists in an improved construction of magnet whereby great magneticenergy is developed and at the same time the magnet is light andconveniently constructed; in the combinatiomwith such a magnet, of theother elements of a telephone; in improvements in the construction ofthe telephone-case, and in certain arrangements and combinations, asmore particularly pointed out hereinafter.

Referring to the accompanying drawings, forming part of thisspecification, Figure 1 is a perspective view 'of the magnet. Fig. 2 isa sectional View of a telephone embodying my invention. Figs. 3 and 4-are details show ing the manner of connecting the terminals.

The magnet consists of two disks, A A, preferably of soft iron, andhaving recesses or depressions on one side,in which are supported anumber of bars of steel or permanent magnets, B O, the central one, B,preferably being larger than the outside magnets, O, the latter beingarranged around the central one and equidistant therefrom and from eachother. Any desired number of permanent magnets may be used, dependingupon the use to be made of it.

The disks A A may be secured in any suitable manner, so as to hold themagnets in position.

To one of the disks is secured a piece of soft iron, D, forming a corefor the helix E, and this core may be formed with a screw-threaded endto fit into the end of the central permanent magnet and thereby hold thedisk in place. A similar piece, D, of soft iron, may be secured to theopposite disk in a similar manner, and when the magnet is used in atelephone this serves as a convenient means for adjusting the relationof the magnet to the (No model.)

other parts, a suitable spring surrounding it and bearing on the end ofthe case, and a screw or bolt, d, passing through the case, serving toadjust the magnet.

This magnet may be used in any form or style of telephone, and I haveshown it as applied to what is known as the hand telephone, it beingpeculiarly adapted to such construction, as it is comparatively lightand yet very powerful.

The telephone-case is made of any suitable materialsuch as rubber,&c.and consists of a body part, M, in the form of a tube havingscrew-threads cut on its ends, to which are secured, at one end, the capN for the bindingscrews, and, at the other end, the cup 0, and to thecup is secured the mouth or earpiece I. A suitable recess is formed inthe cup for the reception of the diaphragm or sounding-plate Q, whichmay be of any suitable material, magnetic or not. I have shown one ofwood, and in this connection I use apiece of magnetic material, It,supported upon the bent angular arm S, shown as secured by the core ofthe electromagnet to the face of the disk A. The spring arm is soconstructed that the plate will normally press against the under side ofthe diaphragm with more or less force, the pressure being controlled, aswell as the distance of the plate from the end of the electro-magnetcore, by means of the screw and spring (1 d. By this arrangement I amenabled to obtain very careful adjustment, and the force of the powerfulcompound-magnet may be adjusted and regulated as desired.

The disks A Aof the magnet are preferably made to fit closely into thetube forming the bodyof the case, suitable slots or holes being formedfor the passage of the conductiugwires e e of the helix.

Considerable difficulty has been experienced in making good electricaland mechanical connections between the terminals of the helix and thebinding-screws. I have shown a very convenient and effective way inFigs. 3 and 4,

which consists in forming the ordinary coun-' tersuuk holes for thescrews Z) b of the bindingposts 1 2, and providing a passage or groove,0, for the wire terminala little at one side of the hole, and thenceinto the flaring part of the countersunk portion, the wire terminalbeing drawn through the passage and then formed into one or more loosecoils around the surface of the countersunk portions, as shown at 0,Figs. 3 and 4, and when the metal screws that secure the binding-postsare placed in position they are caused to bear firmly upon the coils ofthe terminals and tend to force or embed them into the materialsurrounding the holes. By this construction a large bearingsurfaee ofthe terminal is secured, and there is little danger of the ends escapingor of the wire being cut or damaged against the sharp head of the screw.

By making the ease, in the manner described, in four separate pieces Iam enabled to produce it very cheaply, as all the parts are inconvenient shape for handling and tooling,and are easily formed from theoriginal stock.

The parts may be secured in position by locking -pins Z. A rod, u, maybe passed through the plate N and the disk A, to cause the magnet toturn with the plate N when be ing screwed on or off, and to therebypreserve the relations of the parts.

It will be understood that I do not limit my invention to the form oftelephone shown, as

it may be applied to many and various forms without materially departingfrom the spirit thereof.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s

1. Acompound magnet for telephones, consisting of a central permanentmagnet surrounded by a number of other permanent magnets at equaldistance therefrom, soft iron disks joining the ends of the permanentmagnets, a soft-iron core projecting from one of the disks, and a helixsurrounding the core, as and for the purpose set forth.

2. The COlilblllfttlOl1,\Vlth the diaphragm, of a compound magnet,constructed substantially as described, and an angular bent spring-armcarrying a body of magnetic material secured to its end, the springbeing secured to the permanent magnet, between the end thereof and thecoil,and adapted to normally press against the diaphragm, substantiallyas described.

3. The combination, with a telephone-case, of soft'iron disks adapted tofit the body of the case, a series of permanent magnets supported bysaid disks, and a soft-iron core, D, substantially as described.

4:. The combination, with a telephone-case, of a series of permanentmagnets consisting of a large central magnet and smaller ones arrangedconcentrically around the same, softiron disks supporting the magnets, asoft-iron core attached to one disk and surrounded bya helix, and a stemattached to the other disk and provided with adjusting devices,substantially as described.

The combination, with the case of a telephone and abinding-post, of ascrew for holding the bindingpost, said screw fitting a recess in thecase having a passage extending from the recess to surface of the case,and a coiled-wire terminal extending through the passage and coiled orlaid in the reeess,whcreby good electric cont-act is made andmaintained, substantially as described.

In testimony whereof lhave signed my name to this specification in thepresence of two subscribing witnesses.

IIENRY E. WAITE.

lVitnesses:

War. ll. WooDnULL, G. SPARMAN.

